Interior wall-coating.



UNITED STATES PATENT OFFICE.

"WALTER B. ALLEN, OF WORCESTER,- MASSAGHUSETTS, ASSIGNOR TO ALLEN, HALL& 00.,

OF READING, MASSACHUSETTS, A GOPARTNERSHIP.

INTERIOR WALL-COATING.

Specification of Letters Patent.

Patented Aug. 3, 1909.

Application filed November 6, 1907. Serial N 0. 400,928.

To all whom it may concern:

Be it known that I, l/VALTER B. ALLEN, a citizen of the United States,residing at iVorcester, in the county of Worcester and State ofMassachusetts, have invented new and useful Improvements in InteriorVVall- Coatings, of which the following is a specification.

My invention relates to improvements in interior wall coatings and theobject of my invention is to cheapen the cost of such compositions andfacilitate the application of the same.

My composition consists of the following ingredients preferably combinedin the proportions stated, viz z-whiting or other chalky material 85pounds, varnish 3% galions, sand 1 bushel. These ingredients are to bethoroughly mixed by agitation. Any varnish in ordinary use may beemployed, but in those cases where the varnish is somewhat dense andviscous, I find it necessary to temper and thin the same by adding paintoil and turpentine until the resulting compound is of the properconsistency. lVith the cheap rosin varnish which is commonly sold inlarge quantities to the trade, I find that I am able to obtain the bestresults by adding to.- the above ingredients about one gallon each ofpaint oil and turpentine.

My composition is applied by means of a trowel or float to the walls orceiling of a room in the same manner as the skim coat of sand finish isput on a plaster Wall after the first layer of mortar known as thescratch coat is laid upon the lathing. As ordinarily applied my compoundforms a coating about one-sixteenth of an inch in thickness, which issufiicient to cover all cracks, scratches, depressions and otherimperfections in walls and ceilings. Not only may my composition be laidupon plaster or mortar surfaces, but also upon almost any surfaceincluding wood, metal, brick, stone and concrete. In this respect myinvention differs from the finishing coat usually em ployed, whose useis restricted to covering a layer of mortar or plaster.

If desired, coloring matter may be mixed directly with my com oundbefore the same is used upon the Wall, or the composition may be firstlaid u on the surface and then painted in the usua manner. In the formercase, I have found that I am able to obtain better results with oilcolor than with water color, though either can be used with good effect.

I am aware that coloring matter has heretofore been introduced intoordinary plaster or mortar, but the results have been far fromsatisfactory owing to the fact that the lime in the mortar often attacksthe chemical composition of the color and causes it to disintegrate.Even in such case mineral or water colors alone can be used, it beingimpossible to mix in oil color of any kind.

I prefer to miX the several ingredients of my composition in thefollowing manner I first place a considerable uantity of some chalkysubstance preferably whiting free from lumps, in the bottom of a largereceptacle, and then stir in the varnish until there is formedahomogeneous liquid mass. Should the varnish be too thick, so that it isimpos sible to effect a perfect mixture, I am then obliged to pour inasuflicient quantity of turpentine or the like to thin the same, andenough paint oil to temper the drying qualities of the varnish. Thefinal step is now accomplished, by adding beach sand until the entiremixture is of the consistency of common mortar or plaster, and thecomposition is ready for use. i

What I claim and desire to secure by Letters Patent is The hereindescribed composition of matter consisting of whiting eighty-fivepounds, varnish three and one-half gallons, paint oil one gallon,turpentine one gallon, and sand one bushel.

In testimony whereof I have hereunto set my hand in presence of twosubscribing witnesses, this eighteenth day of October 190?.

WALTER B. ALLEN.

Vfitnesses CHAs. F. PERKINS, K. M. SULLIVAN.

